Microplastics affect the nitrogen nutrition status of soybean by altering the nitrogen cycle in the rhizosphere soil

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Yuanfu Li , Li Liu , Xiaoou Meng , Jingsi Qiu , Yanmei Liu , Feng Zhao , Huihua Tan
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Abstract

Microplastics (MPs) are widely distributed in agricultural systems. However, studies on the comprehensive effects of MPs on nitrogen cycling in crop rhizosphere soil, and the changes this effect causes to crop growth is still limited. In this study, we investigated how three types of 5 % MPs (polystyrene, PS; polyethylene, PE; polyvinyl chloride, PVC) affect soybean growth by altering rhizosphere soil nitrogen cycling. These MPs have no direct toxic effects on soybean under hydroponic conditions. However, under soil cultivation conditions, PE and PS promoted soybean growth and increased soybean roots nitrogen content and nitrogen assimilation enzyme activity, while PVC does the opposite. Further study found that PE and PS increased the inorganic nitrogen content, and the activity of nitrogen cycle-related enzymes and the abundance of genes and microorganism in rhizosphere soil. Meanwhile, PVC significantly reduced the inorganic nitrogen contents, inhibited the activity of nitrogen cycling related enzymes, and destroyed the microbial community structure in rhizosphere soil. More importantly, PVC significantly reduced the abundance of nitrogen cycle-related genes and microorganisms, and increased the abundance of viruses. These results indicated that PE and PS promote soybean growth by activating the nitrogen cycle in the rhizosphere soil and increasing the soil nitrogen content, whereas PVC inhibits soybean growth by disrupting the nitrogen cycle in the rhizosphere soil and reducing its nitrogen content.

Abstract Image

微塑料通过改变根瘤土壤中的氮循环影响大豆的氮营养状况
微塑料广泛分布于农业系统中。然而,MPs对作物根际土壤氮循环的综合影响及其对作物生长的影响研究仍然有限。在这项研究中,我们研究了三种类型的5% MPs(聚苯乙烯,PS;聚乙烯、聚乙烯;聚氯乙烯(PVC)通过改变根际土壤氮循环影响大豆生长。在水培条件下,这些MPs对大豆无直接毒性作用。但在土壤栽培条件下,PE和PS促进大豆生长,提高大豆根系氮含量和氮同化酶活性,而PVC则相反。进一步研究发现,PE和PS提高了根际土壤中无机氮含量,提高了氮循环相关酶的活性以及基因和微生物的丰度。同时,PVC显著降低了根际土壤无机氮含量,抑制了氮循环相关酶的活性,破坏了根际土壤微生物群落结构。更重要的是,PVC显著降低了氮循环相关基因和微生物的丰度,增加了病毒的丰度。结果表明,PE和PS通过激活根际土壤氮循环、提高土壤氮含量促进大豆生长,而PVC通过破坏根际土壤氮循环、降低土壤氮含量抑制大豆生长。
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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